uni-app搭建的微信小程序项目中使用ECharts, 记录一下自己的使用,以及过程中遇到的问题

参考自:uniapp在微信小程序中使用 ECharts_wxh958548129的博客-CSDN博客_uniapp小程序使用echarts

https://github.com/MissionWang/mpvue-echarts

1.引入npm install echarts mpvue-echarts

2.ECharts 在线构建定制echarts的js文件,选择自己项目需要的图表及组件,可以选择进行代码压缩

3.将定制文件放在common下,将node_modules下面的mpvue-echarts->src复制到components,如下图

4.页面使用

<template>
	<view>
		<view class="echarts-wrap">
			<my-echarts id="main" ref="mapChart" :echarts="echarts" :onInit="initChart" />
		</view>
	</view>
</template>

<script>
	import * as echarts from '@/common/echarts.min.js';
	import myEcharts from '@/components/mpvue-echarts/src/echarts.vue';

	export default {
		components: {
			myEcharts
		},
		data() {
			return {
				echarts,
			}
		},
		onReady() {
			uni.hideHomeButton()
		},
		onLoad() {
		},
		methods: {
			initChart(canvas, width, height) {
				console.log('图标', canvas);
				let chart = null
				chart = echarts.init(canvas, null, {
					width: width,
					height: height
				});
				var option = {
					throttleTouch: true,
					title: {
						text: 'ECharts 入门示例'
					},
					tooltip: {},
					legend: {
						data: ['销量']
					},
					xAxis: {
						data: ['衬衫', '羊毛衫', '雪纺衫', '裤子', '高跟鞋', '袜子']
					},
					yAxis: {},
					series: [{
						name: '销量',
						type: 'bar',
						data: [5, 20, 36, 10, 10, 20]
					}]
				}; // ECharts 配置项

				chart.setOption(option);

				return chart; // 返回 chart 后可以自动绑定触摸操作
			}
		}
	}
</script>

<style>
	.echarts-wrap {
		width: 100%;
		height: 300px;
	}
</style>

 5.报错:this.echarts.setCanvasCreator is not a function 的解决办法

参考:uni-app使用mpvue-echarts报this.echarts.setCanvasCreator is not a function的错误 的解决办法 - DCloud问答

echarts.vue页面引起的  prors不能传递方法

将刚才定制的echarts.js文件引入进去

import * as echarts from '@/common/echarts.min.js';

参数加this

this.ctx = wx.createCanvasContext(canvasId,this);  

const query = wx.createSelectorQuery().in(this);  

也可以直接复制代码进去,注意修改echarts.js的路径

<template>  
  <canvas v-if="canvasId" class="ec-canvas" :id="canvasId" :canvasId="canvasId" @touchstart="touchStart" @touchmove="touchMove" @touchend="touchEnd" @error="error"></canvas>  
</template>  

<script>  
import WxCanvas from './wx-canvas';  
import * as echarts from '@/common/echarts.min.js';

export default {  
  props: {  
    // echarts: {  
    //   required: true,  
    //   type: Object,  
    //   default() {  
    //     return echarts;  
    //   }  
    // },  
    onInit: {  
      required: true,  
      type: Function,  
      default: null  
    },  
    canvasId: {  
      type: String,  
      default: 'ec-canvas'  
    },  
    lazyLoad: {  
      type: Boolean,  
      default: false  
    },  
    disableTouch: {  
      type: Boolean,  
      default: false  
    },  
    throttleTouch: {  
      type: Boolean,  
      default: false  
    }  
  },  
  onReady() {  
    this.echarts = echarts;  

    if (!this.echarts) {  
      console.warn('组件需绑定 echarts 变量，例：<ec-canvas id="mychart-dom-bar" ' + 'canvas-id="mychart-bar" :echarts="echarts"></ec-canvas>');  
      return;  
    }  

    console.log('echarts');  
    console.log(this.onInit);  

    if (!this.lazyLoad) this.init();  
  },  
  methods: {  
    init() {  
      const version = wx.version.version.split('.').map(n => parseInt(n, 10));  
      const isValid = version[0] > 1 || (version[0] === 1 && version[1] > 9) || (version[0] === 1 && version[1] === 9 && version[2] >= 91);  
      if (!isValid) {  
        console.error('微信基础库版本过低，需大于等于 1.9.91。' + '参见：https://github.com/ecomfe/echarts-for-weixin' + '#%E5%BE%AE%E4%BF%A1%E7%89%88%E6%9C%AC%E8%A6%81%E6%B1%82');  
        return;  
      }  

      if (!this.onInit) {  
        console.warn('请传入 onInit 函数进行初始化');  
        return;  
      }  

      const canvasId = this.canvasId;  
      this.ctx = wx.createCanvasContext(canvasId,this);  

      const canvas = new WxCanvas(this.ctx, canvasId);  

      this.echarts.setCanvasCreator(() => canvas);  

      const query = wx.createSelectorQuery().in(this);  
      query  
        .select(`#${canvasId}`)  
        .boundingClientRect(res => {  
          if (!res) {  
            //setTimeout(() => this.init(), 200);  
            return;  
          }  

          this.chart = this.onInit(canvas, res.width, res.height);  
        })  
        .exec();  
    },  
    canvasToTempFilePath(opt) {  
      const { canvasId } = this;  
      this.ctx.draw(true, () => {  
        wx.canvasToTempFilePath({  
          canvasId,  
          ...opt  
        });  
      });  
    },  
    touchStart(e) {  
      const { disableTouch, chart } = this;  
      if (disableTouch || !chart || !e.mp.touches.length) return;  
      const touch = e.mp.touches[0];  
      chart._zr.handler.dispatch('mousedown', {  
        zrX: touch.x,  
        zrY: touch.y  
      });  
      chart._zr.handler.dispatch('mousemove', {  
        zrX: touch.x,  
        zrY: touch.y  
      });  
    },  
    touchMove(e) {  
      const { disableTouch, throttleTouch, chart, lastMoveTime } = this;  
      if (disableTouch || !chart || !e.mp.touches.length) return;  

      if (throttleTouch) {  
        const currMoveTime = Date.now();  
        if (currMoveTime - lastMoveTime < 240) return;  
        this.lastMoveTime = currMoveTime;  
      }  

      const touch = e.mp.touches[0];  
      chart._zr.handler.dispatch('mousemove', {  
        zrX: touch.x,  
        zrY: touch.y  
      });  
    },  
    touchEnd(e) {  
      const { disableTouch, chart } = this;  
      if (disableTouch || !chart) return;  
      const touch = e.mp.changedTouches ? e.mp.changedTouches[0] : {};  
      chart._zr.handler.dispatch('mouseup', {  
        zrX: touch.x,  
        zrY: touch.y  
      });  
      chart._zr.handler.dispatch('click', {  
        zrX: touch.x,  
        zrY: touch.y  
      });  
    }  
  }  
};  
</script>  

<style scoped>  
.ec-canvas {  
  width: 100%;  
  height: 100%;  
  flex: 1;  
}  
</style>